wallace



W. WALLACE.

HYDRAULIC TELEMOTOR,

APPUCATION FILED FEB. 25. I919 1,3QL21 Patented June 17, 1919.

4 SHEETS-SHEET I. F/G./. F/G.2.

IN YE'N TOR DTO-LIYHO..WASHINGFUN. n c.

W. WALLACE. HYDRAULIC TELI-IMOTOR I APPLICATION FILED FEB. 25. I919.amar,

4 SHEETS-SHEET 2.

$3.. Flaw Patented June 17, 1.)19.

Ah WALLACE.

HYDRAULIC TELEMOTOR.

APPLiCATION FILED FEB. 25. 1919.

1,307,281 Patented June 17, 1919.

4 SHEETS-SHEET 3 W. WALLACE.

HYDRAULIC TELEMOTOR.

APPLXCATION FILED FEB. 25. 1919.

4- SHEETS-SHEET 4.

Patented June 17, 1919.

INVENTOR UNITED airs manna option WILLIAM WALLACE, 0F EDINBURGH,scornnnn.

HYDRAULIC TELEMO'IOR.

isomer.

Application filed February 25, 1919. Serial No. 279,139.

To all whom it may concern:

Be it known that. I, l/VILLIAM WALLACE, a subject of the King of GreatBritain and Ireland, and a resident of Edinburgh, Scotland, haveinvented certain new and useful IIHPIOVBIHGIltSgiD Hydraulic Telemotors,and of which the following is the specification.

In hydraulic telemotors for controlling ships steering gear and thelike, for operating indicators and for performing like functions at adistance, there is a transmitting apparatus and a receiving apparatus inwhich are pistons connected in a normally closed circuit so that thereceiver piston or pistons) moves in normal snychronism with thetransmitter piston (or pistons). But the receiver is apt in use tobecome out of correlation with the transmitter. Hitherto, in order tocorrect this fault there has been provided in the transmitter a by-passor equivalent device operating at mid-position of that apparatus toconnect opposite sides of the hydraulic system momentarily, and in thereceiver spring operated means for moving that apparatus tomid-positionwhen the transmitter by-pass is momentarily 1n operationthusbringing transmitter and receiver again into proper correlatlon eachtime mid-position is reached. However, it is apparent that by the timethe transmitter has reached the end of its stroke there may be a certainwant of correlationuncorrected until mid-position is passed again andobviously becoming greater and greater if the apparatus be operated fora time without 1ts reaching the only point at which correlation canagain be establishednamely, midposition.

The invention has for its object to overcome this disability, and byproviding means for establishing correlation between transmitter andreceiver at a series'of points in their strokes to produce a telemotorof an accuracy of movement very much greater than that of those hithertogenerally in use.

According to the invention there is provided in the transmitter aby-pass devicethat is to say, a device momentarily connecting theopposite sides of the hydraulic system-which is mechanically operatedfrom the mechanism operating the transmitter piston or pistons to makeconnection between opposite sides of the system IIlOlnGIltitIllY at aseries of determinate positions in the stroke of the transmitter. Thereis operatively connected to the receiver a device operated mechanicallyfrom its piston or pistons and adapted to move that apparatus to acorresponding position synchronously with the operation of thetransmitter by-pass at each and all of the series of determinatepositions. Thus, whenever the transmitter reaches a determinateby-passing position, the receiver is automatically brought eX- actly tothe corresponding position to which it is of course adjacent in anycase.

The by-pass device operated from the transmitter may comprise valves orcocks of any convenient type. It is operated by intermittent gearing orcam mechanism from the gearing by which the piston or pistons of thetransmitter are moved in suchwise that by it communication ismomentarily established between opposite sides of the hydraulic systemat a series of determinate points in the stroke of the transmitter. Thisby-pass device preferably controls also the usual supply of replenishingor make up liquid.

The receiver-correcting device consists of spring or equivalently loadedmeans for in termittently imposing on the receiver piston or pistons aforce tending to bring it (or them) to a series of positionscorresponding with the open by-pass positions of the transmitter that isto say, so applying a force to the receiver piston that it is broughtinto correlation with the corresponding trans mitter position whicheverdirection therefrom it may have strayed. This device may veryconveniently consist of crank or cammechanism operatively connectedthrough gearing with the receiver piston and so spring-loaded that ittends to assume a definite positionthe gearing being so proportionedthat it tends to assume a series of successive similar positions 4correspondingly with the successive positions of the transmitteroperated by-passing devices.

When the improved telemotor is used for indicating a series of definitepositions on dialsfor example, as when applied to a ships telegraph orthe like-the pointers traversing the dials at the transmitting andreceiving stations may be operated from the respective instruments bystep-by-step mechanism such as the well-known Geneva movement.

It will be seen that in the improved telemotor there is provided anapparatus in is I which definite correlation of "the receiving devicewith the transmitting device is attained and maintained indefinitely.

An illustrative example of the application of the invention to a shipstelegraph is shown in four accompanying sheets of exqblaiiatoiydraivings, Figures 1 and 2, Sheet 1, being respectively sectionalfront-and sectional side elevations of the transmitter, Figs. 3 andfl,Sheet 2, like views of the receiver, while Figs. 5,6, and 8, Sheet 3,are views of the transmitter detailed. and Fig. Sheet 4;, a diagrammaticgeneral a1- rangement of the Whole plant. r The tnnsmitter is of thattype having two vertical cylinders A side by side in which operate ramsA? having on them racks A engaged by a pinion A intermediate to them, sothat on its rotation the rack-bearing .rams are inoved in oppositedirections. Thepinion N is fast on a transverse shaft in the housing, onwhich shaft is fast'a spur-wheel B engaged by a pinion Qfast on'a shaftCfhaving on its outer end a h andwheel C by which the transmitter isoperated. i On this handwheel shaft 0 is fast the ,single toothedgear 1) of a Geneva stepby-step movement(Fig. 5) the correspond ingwheel D of which is on a short shaft D connected by a pair of bevelwheels D Witha; shaft bearing a pointer Ditraversing a dial D having theusual indications.

The handwheel shaft has "also on it a disk E (Figs. 6 and 7) which hasfixed on it. are E of bevel teeth which gear intern it t ently with abey'el pinion E on a ver-' ticalsh'aft E The disk E is-also so formed asto ,act as a 1601; between the shafts C E when the are E is not inengagement with the pinion E and to this end is of such diameter that it,bears against one or other of the .face s of a hexagon disk E fast onthe spindle E at all points of its circumference exee 't ear the are,11?, at which point there is 'c'ut in it a gap E to permit of rotationo'f the shaft E On .the lower end of the shaft E? is formed a packedparallel p-lug cock F (Fig. 8), In this cock are three ports which maybe caused, as ioivn in S to, interconfleet'nietwo cylinders A by way ofpassages F F with each other and jointly by way of a passage F with theusual supply of make-upv liquid. In intermediate positions "the book ofcourse closesthese connections.

The g earing between the parts such that once for each revolution of thehandwheel G the cock is operated to byrpass the cylinders AAthat is,tofthrow them into communieation with each other and with the make-upsupply. At the same time, the pointer caused. by the Geneva movenent totraverse one division of its dial D Thus, ste'p-by-stepone for eachrevolution other, the H will ifo'r'tli oppositesides being thrown intocommunication AsTeg'ards the cylinders, rains and their allied parts(which are therefore given the same reference characters) the reeeiver'sliown in Figs. 3 and a is substantially identical with thetransin'itterthat is to say, rackbearing rams A operate in cylinders Aand engage a pinion A on a shaft The shaft B in this case extendslaterally'oiit through the casing andbears on its end a pointertraversing a dial G bearing indications corresponding withthose on thetransmitter dial 1). On the'shaft B isfalso a spuiwheel H gearing with apinion H on a parallel shaft H beneathit. On the end of this shaft is acrank H the pin of which engagged by a connecting rod H? sliding" 'ipona rod Hsaiichored to a pin H? fast onthe cas ing. Between cups H (one ofwhich is adjustable) on these rods H}, fliisarriinged a helicalspring Hin compression and thus always tending to throw the crank H to the topof itssti'oke'in which position itis shown, I 1 a 'On the shaft is "thesingle. toothedpinion J of'a Geneva movement, the wheel. J

.. i i. ,1 l i .1 o

of which s loose on the shaft 13 and carrles pointer Gr. These aresimilar to what 's shown in Fin. 5 as applied is the transmitter andserve to steady the movements of the n l a i r a v The gearin is soprtpoaibne it eatsmitterand receiver that as the formerlreaches eachbypassing station the crank H 'isat the top,o f its stroke f no leakagehas taken place. If any leakage h'as taken place, how- YQ F- a. ciselyat that po nt, it is apparent that the and the crank is ther'efore "notpreppera i liquid being {genus moment 'free to pass from one sic-leo'li' the in to the the crank to the top of i s stroke aiid,;s'o bring thereceiver into agreement with the transmitter. Further movem ei'totattests mitter handvvheel C of course immediately 7 i l i ,lg. 1'1" icloses the by-pass connection, and the receiver again commences to moven synchronisln witl tlie 15ransn1'iarnnt3 ai'egnextjty- :passing'station is reached, b Iivhich time its stroke,

the crank is again at the top of and correction :(if it be not quitethere) again takes-place. V i H I11tl1'e cliagram of an installationshown in Fig. 79,, transmitter and freceiy 'er. are coneaa by the usualma p ps t, while the 'by-paiss valve 'bo'Y M is connect pip'eiv'itligthe usuii tial alji tank M I i e senti t at t e s st m d. Li i sn e ibleh f e r m, ja l, Q i I in the operating" liquid andotherwise-presany ith throw exit, and to that end there are provided on1 v,

the transmitter and receiver cylinders air release valves N (these ofordinary needle type are to be seen in detail in Fig. 8). Pipes Pconnect the cylinders of the receiver by way of stop valves Prespectively with a pump P and with a reservoir P of the liquid used. Apipe P in turn connects the reservoir with the pump P which is ofordinary plunger form operated by a handlever P In order to free thesystem from air, the air release valves N and the stop valves P areopened and the transmitter is placed in by-passing position. The pump isthen operated and liquid is circulated through the system until itissues from the valves N which are then closed. Pumping is con tinueduntil the discharge to the tank P pulsates synchronously with thestrokes of the pump. The stop valves P are then closed and the system isready for work.

Mechanical or electrical devices for giving audible signals may beoperatively connected to one or both instruments.

It is to be understood that the foregoing example is illustrative only,and that the details of the carrying out of the invention may besomewhat widely varied without departing from its essencerwhich is theprovision of means in the transmitter for bypassing the system atsuccessive points in combination with means for bringing thethen-relieved receiver into correlation.

What I claim is 1. In a telemotor system having pistonand-cylindertransmitting and receiving instruments; means in the transmittinginstrument for by-passing the system at successive points and means forbringing the receivinginstrument when it is then relieved intocorrelation.

2. A telemotor system forming the subject-matter of claim 1 hereof,comprising a by-pass valve device mechanically operated from thehandwheel of the transmitting instrument and momentarilyinter-connecting opposite sides of that system with one another and witha make-up supply during the rotation of the handwheel.

3. The telemotor system forming the subject-matter of the foregoingclaims hereof, comprising a multi-ported plug cock con.- trollingconnection between opposite sides of the system and operated byintermittent gearing from the handwheel of the transmitting instrument.

4. A transmitting instrument for the telemotor system forming thesubject-matter of the foregoing claims hereof comprising tworack-bearing rams operating in cylinders and engaged by a pinion betweenthem which pinion is operatively connected to a handwheel, a train ofinterrupted gearing operating a plug cock controlling communicationbetween opposite sides of the system and operated from said handwheel,means for locking said cock against rotation during its interruptedperiods and means for operating from the handwheel a pointer traversinga dial.

5. The telemotor system forming the subject-matter of claims 1 to 3hereof, comprising receiver-correcting means consisting of a spring orequivalently controlled device adapted to successively return thereceiver parts to correlation when the system is freed by the successiveoperations of the by-passing device.

6. The telemotor system forming the subject-matter of claims 1 to 3 and5 hereof, comprising receiver correcting means consisting of a crank sooperatively connected to the receiver piston or pistons that it isnormally moved to a position at which it is held by a spring orequivalent successively at each successive by-passing motion in thetransmitting instrument,

7. A receiving instrument for the telemotor system forming thesubject-matter of the foregoing claims hereof, comprising rack-bearingrams operating in cylinders and engaging a pinion between them whichpinion is connected by gearing to a crank, a spring operativelyconnected to the crank in suchwise as to cause it to seek a determinateposition, the crank being so placed and the gearing which operates itbeing constructed and arranged to cause the crank to be normally at thatposition when successive by-passings take place in the transmittinginstrument.

In testimony whereof I name to this specification.

WILLIAM WALLACE.

have signed my Copies of this patent may be obtained for five centseach, by addressing the Commissioner of Patents, Washington, D. 0.

